Smoke-tube boiler.



J. STDLLBRZ.

SMOKE TUBE BOILER.

MPL10/1121011 FILED 111111127, 1911.

1,01 l, Patented 118012,1911.

r UWM/gi JOHANNES STOLLERZ, OIEI OSTERODE-IN-THE-HARZ, GRMANY. i

SMOKE-TUBE norman.'

To all'whom 'it may concern:

Be it known that I, J oHaNNns SroLLnRz, ofOsterode-in-the-I-Iarz,Germany, a citizen of the German Empire, haveinvented certain new and useful Improvements in Smoke-Tube Boilers, Aofwhich the following is a specification.

The subject-matter of `my invention is a device in vertical orhorizontal smoke tube or multitubular boilers for obtaining a quietcombustion process uon the grate, whereby `not only is the carrying awayof unconsumed particles of coal from the surface ofthe grate into thesmoke box and into 4the open air diminished orentirely obviated, but abetter ut-ilization of the heating surface is obtained. I attain theseends by equalizing thevarious strengths of draft in the individual smoketubes by building into the smoke box a cage of wire netting, the widthof whose meshes at those laces, which are located at the tubesotherwisehaving a great strength of draft, is smaller than at thoseplaces, which are located at the tubes otherwise having a small strengthof draft. Instead of the wire netting there .may be employed an ironplate with perforations of analogously different width. This iron plateis preferably undulated. As the smoke issues in the direction of thesmoke tubes in vertical boilers and transversely of this direction inhorizontal boilers, it follows that the position and arrangement of theinserted cage of netting or perforated plate having meshes of variouswidth will vary in each instance.- In vertical boilers the cage composedof wire netting or perforated plate will be rectilinear ,or slightlyarched and of the shape of the section of the smoke box and will possessin the middle, i. e. under the smoke stack as the draft is strongestthere, small meshes which become larger continuously or stepwise towardits edges. In horizontal boilers, particularly locomotive andportable-engine boilers, the cage of wire nettlng or perforated platewhen seen from the front will have thev form of a sickle shaped roofsurrounding the ends of the tubes. i

-One illustrative embodiment of the inventionas applied to the smoke boxof a horizontal boiler isrepresented by way of .example in' theaccompanying drawing, where- .Figure 1 represents a Ilongitudinalsect-.ion on line 1--1 of Fig. of a locomotive biler Specification ofLetters Patent.

Application filedl June 27, 1911. Serial No. 635,581.'

dii. il f- Patentedpec. 12, 1911.

and smoke box embodyingnone f orntof this e invention. section of thesmoke box `on line vf Fig. 1. Fig. 3 representsfa transverse 4siectionof a smoke box embodying anotherforni of this invention.

Fig. 2 represents'a transverse The same reference cliaractersiareused-'in i all the figures in the designation of the same parts.

Referring to the drawing, a. designates the fit-ting consisting of anapproximately cylindrical cage of wire netting mounted in a suitablemanner on a stifi'ening iron frame or stays in the smoke box b, or of anundulated perforated iron plate; asFigs.' 2 and 3 show, the cage restsat the rear end against the tube shaft or fluye head of the boiler andsurrounds the ends of vthe smoke tubesc in such manner that the fluegases issuing from them have no free path'to the smoke stack el. Thefitting a has smaller meshes-or perforations at the'top, 'or at `theplaces where the draft isstrongest, than'4 at the sides. If the draft isnevertheless'too strong at the top, I place a nonperforated platethereon, that is to say I entirely cover over some of the meshes orperforations.

The lower' edges c of the wire fitting are connected to non-perforatedplates f extending to the bottom of the smoke box. In the case of aperforated iron plate forming the fitting this plate is bent to form theplates f.

The front end of the cage or fitting is preferably provided withstraight or vertical edges it 1n its upper part and with slanting edges71. in its lower part, these slanting edges sloping downward andbackward from the door L and the vertical edges abuttin against saiddoor. Plates g extcndat bot sides from the front edges h of the cage tothe wall z' of the smoke box. This arrangement if for causing a strongerdraft at t-he lower and lateral smoke tubes, relatively to the weakerdraft caused at the middle and upper smoke tubes, when the need thereforoccurs. The upper horizontal part Z of the fitting a is preferablyformed as a damper plate, while the side walls of the fitting are cutlongitudinally and provided at the edges with hinges m in order to beable to turn their lower parts inwardly upward, for the purpose ofremoving the coal dust lying behind them.

In all cases the area of the wire netting and the number and size of itsmeshes or of the perforations of theV iron plate replacing -it is madeweaker 'the netting are such that the total Varea of the apertures isatleast equal to the total sectional area of the smoke tubes.

In order to prevent the netting being warped or twisted by heat or' itsown weight, rom below upward and is consequently lighter in itselftoward the top.

-I claim 1. The combination of a steam boiler, a

smoke box provided with a smoke outlet, a

' flue sheet separating the'boiler and smoke separating said boiler andsaid smoke box,

lues disposed in said boiler and havingtube ends opening into said smokebox through said fiuesh'eet, and an incomplete cylindrical oagedisposedin said smoke box against said tlue sheet and surrounding said tubeends, said cage being provided in its lower front portions with edgeswhich slant doWnward toward the rear,`with plates extending smoke boxprovided from said edges to the shell of the smoke box and with platesextending from its lower edges to the bottom of the smoke box.

3. The combination of a steam boiler, a smoke box provided with a smokeoutlet, a flue sheet separating the boiler and smoke box, flue tubesdisposed in said boiler and having tube ends'opening into said smoke boxthrough said flue sheet, and a cage of wire netting' mounted betweensaid outlet and the ends ofsaid tubes and surrounding said ends andprovided with a solid upper port-ion.

4. The combination of a steam boiler, a with a'smoke outlet, a fluesheet separating the boiler and smoke box, flue tubes disposed in saidboiler and having tube ends opening into said smoke box through saidflue sheet, and a cage of wirenetting mounted between said outlet andthe ends of said tubes, the netting being weaker and lighter and themeshes thereof smaller from below upward, and provided with a solidupper portion.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

JOHANNES STOLLERZ.

Witnesses:

DIETRICH SUsEMIm., AUGUST JANNASTH.

